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An FBI agent escorts an unidentified man from the apartment of Najibullah Zazi in Aurora, Colo. Photo: AP

A suspected al Qaeda terrorist from Queens was grilled for a second day by FBI agents in Colorado yesterday — as a report emerged that bomb-making diagrams were found on a computer he carried with him on a visit to New York.

The second questioning session came as detectives pored over nine backpacks confiscated in a Queens raid Monday to see if they’d come into contact with explosives, sources said.

Surveillance also is underway at about a half-dozen addresses in or around New York, according to the sources.

CNN reported diagrams showing how to make bombs were found on Zazi’s computer when cops stopped him on the George Washington Bridge.

“There’s no diagram of a bomb,” insisted his lawyer Arthur Folsom, adding that if such evidence had turned up, “Do you really think the FBI would have allowed us to walk out of here?”

Folsom also denied an Associated Press report that Zazi had contact with a known al Qaeda associate, saying, “He’s simply somebody who was in the wrong place at the wrong time.”

A grim-faced Zazi, who has not been charged, arrived at the FBI’s Denver offices at around 2 p.m. and was questioned for eight hours before being sent home. He’s due back today.

Zazi, 24, who sources said trained at a Pakistani terror camp, had answered all the agents’ questions Wednesday night, except for one requiring him to speculate about the actions of the NYPD, his lawyer said.

“[Wednesday night’s] interrogation was actually a very cordial question-and-answer session,” said his other lawyer, Armstrong Graham.

Also yesterday, it was revealed that Zazi filed for bankruptcy earlier this year, listing more than $50,000 in credit-card debt.

Agents turned up the heat on Zazi after he rented a car and drove to the Big Apple last weekend. They then raided the three Queens homes he had visited.

Investigators believed they had uncovered a plot to “blow up several places simultaneously and take out as many people as possible,” a source said.

During Wednesday’s questioning, Zazi’s home and one belonging to his aunt and uncle were raided; it wasn’t clear if anything was seized.

After Zazi was released Wednesday night, he voluntarily submitted DNA and handwriting samples and his fingerprints, Folsom said.